Welcome to my Homepage

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SVG stuff

• SVG (Scalable Vector Graphics) is a XML format for displaying figures in 2 dimensions.
• It is an official format of the W3C (World Wide Web Consortium).
• SVG is widely used for the user interface of mobile phones (in 2008, about 600 million handsets).
• SVG can also be used on desktop computers, for embedding vector graphics in HTML documents.

	Title	Description
	SVG to Flash compiler	A paper and some SVG or Flash/SWF animations presented in August  2008 at the SVG Open  2008 conference, at Nuremberg in Germany.
	SVG control panels	A paper and some SVG animations presented in August  2005 at the SVG Open  2005 conference, at Enschede in the Netherlands.
	Simple SVG viewer	A small Java Applet that I developed in 2001.

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Parametric gears designed with Catia V5

What is Catia?

• Catia is a mechanical CAD system invented in the seventies by the
  "Avions Marcel Dassault - Bréguet Aviation" company, a military aircraft manufacturer.
• Despite its venerable age, CatiaV5 is probably the most powerful 3D CAD system available today.
• Once written in Fortran and running on IBM mainframes, it has become a C++ sofware
  that runs perfectly on any PC having 1GB RAM and hardware-accelerated 3D graphics.

The gear tutorial

• In May and June 2005, I attended a training session for learning how to use Catia V5.
• After that, I tried to design spur gears controlled by a few parameters (diameter, pitch, etc).
• I started with a good Catia tutorial devoted to the same subject,
  then I wrote my own tutorial for designing other kinds of gears.
• I hope that the geometric model of my gears is close to the design of real gears,
  so let me know if you notice some mistake.

	Title	Description
	Spur gears	How to design a parametric spur gear.
	Bevel gear	That parametric part can produce bevel gears varying from the spur gear to a "flattened gear".
	Worm	A screw-shaped gear.
	Helical gear	An helical gear, used with a worm for making a toy gearbox.
	Internal gear	This tutorial explains how to use internal gears for making an epicyclic gearbox.

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Les moteurs de Marius Lavet

Here are some pages about the patent and designs created in 1936 by Marius Lavet,
absolutely unrelated to the movies filmed by Marcel Pagnol at the same time.

Who is that guy?

• For quite a long time, I wondered about the origins of the stepper motor,
  but in 2005 I learned that it is a creation of Marius Lavet, a French engineer.
• Currently, Marius Lavet is considered as the inventor of the pulse motor
  miniaturized and integrated in most of the quartz watches.
• But he has also nearly invented the permanent magnet stepper motor.

A variant of the permanent magnet motor

• When you examine the Lavet patent FR823395,
  you can notice many other devices than the miniature pulse motor.
• So I tried to extrapolate the different mechanisms proposed in the patent
  in order to make an archaic pre-WW2 stepper motor.
• You can compare it with the current design of "can stack" permanent magnet motors.

	Title	Description
	Marius Lavet	The inventor of the stepper motor used in quartz watches
	FR823395	A fac-simile of the original patent, extracted from the European patent database and converted to HTML with an OCR tool. The patent includes 78 figures
	pm_36 (500 KB)	Catia assembly showing a variant of the patented devices.
	pm_42 (950 KB)	Catia assembly of a real permanent magnet stepper motor.

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About Me

• Curriculum vitæ.